EXT_sRGB - Web APIs 编辑

The EXT_sRGB extension is part of the WebGL API and adds sRGB support to textures and framebuffer objects.

WebGL extensions are available using the WebGLRenderingContext.getExtension() method. For more information, see also Using Extensions in the WebGL tutorial.

Availability: This extension is only available to WebGL1 contexts. In WebGL2, the functionality of this extension is available on the WebGL2 context by default. The constants in WebGL2 are: gl.SRGB, gl.SRGB8, gl.SRGB8_ALPHA8 and gl.FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING.

Constants

This extension exposes the following constants, which can be used in the texImage2D(), texSubImage2D(), renderbufferStorage() and getFramebufferAttachmentParameter() methods.

ext.SRGB_EXT

Unsized sRGB format that leaves the precision up to the driver.

ext.SRGB_ALPHA_EXT

Unsized sRGB format with unsized alpha component.

ext.SRGB8_ALPHA8_EXT

Sized (8-bit) sRGB and alpha formats.

ext.FRAMEBUFFER_ATTACHMENT_COLOR_ENCODING_EXT

Returns the framebuffer color encoding (gl.LINEAR or ext.SRGB_EXT).

Examples

var ext = gl.getExtension('EXT_sRGB');

var texture = gl.createTexture();
gl.bindTexture(gl.TEXTURE_2D, texture);

gl.texImage2D(gl.TEXTURE_2D, 0, ext.SRGB_EXT, 512, 512, 0,
              ext.SRGB_EXT, gl.UNSIGNED_BYTE, image);

Specifications

Browser compatibility

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The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

See also

• WebGLRenderingContext.getExtension()
• WebGLRenderingContext.texImage2D()
• WebGLRenderingContext.texSubImage2D()
• WebGLRenderingContext.renderbufferStorage()
• WebGLRenderingContext.getFramebufferAttachmentParameter()